Varnish is a popular reverse proxy used to accelerate pages by caching static HTML, but it doesn’t natively support SSL/TLS, as required by HTTP/2. So how can we achieve high performance using Varnish with HTTP/2?

“you can now launch Spot instances that will run continuously for a finite duration (1 to 6 hours). Pricing is based on the requested duration and the available capacity, and is typically 30% to 45% less than On-Demand”